How are the GUIs for Samba 4.0 AD features? I usually prefer nice configuration files, but the Windows Server features were very easy to learn. Another nice thing about Windows Server, updates are "free" after a high up-front cost.

The windows ones apparently work with this version of Samba.

I bet the next patch Tuesday will solve that.

The usual MMC snapins probably work with it.

"free, as in cheap" does not apply in the case of an existing infrastructure with staff already trained on using the deployed (AD) system.

Not immediately, but the thing that people can set up and try and say "yeah, sure, problem solved" has a funny way of making it's way into the rack. Whether it does or doesn't in a specific case usually just comes down to whether the one supporting it likes Vi, Emacs, or Word.

Google Docs has no relation to OpenOffice iirc. The word processor came from writely and the spreadsheets was some other company's source code, the rest was just extensions on that.